Patch "net: ipv6: tcp: fix potential use after free in tcp_v6_do_rcv" has been added to the 3.10-stable tree

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This is a note to let you know that I've just added the patch titled

    net: ipv6: tcp: fix potential use after free in tcp_v6_do_rcv

to the 3.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-ipv6-tcp-fix-potential-use-after-free-in-tcp_v6_do_rcv.patch
and it can be found in the queue-3.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 8ae50caa631ec336efee755358de38db683b86cb Mon Sep 17 00:00:00 2001
From: Daniel Borkmann <dborkman@xxxxxxxxxx>
Date: Tue, 3 Sep 2013 19:29:12 +0200
Subject: net: ipv6: tcp: fix potential use after free in tcp_v6_do_rcv

From: Daniel Borkmann <dborkman@xxxxxxxxxx>

[ Upstream commit 3a1c756590633c0e86df606e5c618c190926a0df ]

In tcp_v6_do_rcv() code, when processing pkt options, we soley work
on our skb clone opt_skb that we've created earlier before entering
tcp_rcv_established() on our way. However, only in condition ...

  if (np->rxopt.bits.rxtclass)
    np->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb));

... we work on skb itself. As we extract every other information out
of opt_skb in ipv6_pktoptions path, this seems wrong, since skb can
already be released by tcp_rcv_established() earlier on. When we try
to access it in ipv6_hdr(), we will dereference freed skb.

[ Bug added by commit 4c507d2897bd9b ("net: implement IP_RECVTOS for
  IP_PKTOPTIONS") ]

Signed-off-by: Daniel Borkmann <dborkman@xxxxxxxxxx>
Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Acked-by: Jiri Benc <jbenc@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ipv6/tcp_ipv6.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1426,7 +1426,7 @@ ipv6_pktoptions:
 		if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim)
 			np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit;
 		if (np->rxopt.bits.rxtclass)
-			np->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(skb));
+			np->rcv_tclass = ipv6_get_dsfield(ipv6_hdr(opt_skb));
 		if (ipv6_opt_accepted(sk, opt_skb)) {
 			skb_set_owner_r(opt_skb, sk);
 			opt_skb = xchg(&np->pktoptions, opt_skb);


Patches currently in stable-queue which might be from dborkman@xxxxxxxxxx are

queue-3.10/packet-restore-packet-statistics-tp_packets-to-include-drops.patch
queue-3.10/net-bridge-convert-mldv2-query-mrc-into-msecs_to_jiffies-for-max_delay.patch
queue-3.10/net-ipv6-tcp-fix-potential-use-after-free-in-tcp_v6_do_rcv.patch
queue-3.10/net-rtm_to_ifaddr-free-ifa-if-ifa_cacheinfo-processing-fails.patch
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